/Engine/Source/Editor/UnrealEd/Classes/CookOnTheSide/CookOnTheFlyServer.h
Marks a package as dirty for cook causes package to be recooked on next request (and all dependent packages which are currently cooked)
void MarkPackageDirtyForCooker ( [UPackage](API\Runtime\CoreUObject\UObject\UPackage) * Package, bool bAllowInSession )